Lunyu VII. 3. (153)

Confucius's anxiety about his self-cultivation:– another humble estimate of himself.
The Master said, "The learning virtue without proper cultivation; the not thoroughly discussing what is learned; not being able to move towards righteousness of which a knowledge is gained; and not being able to change what is not good:– these are the things which occasion me solicitude."

Legge VII.3.

The Master said, 'It is these things that cause me concern: failure to cultivate virtue, failure to go more deeply into what I have learned, inability, when I am told what is right, to move to where it is, and inability to reform myself when I have defects.'